I have NCd for this.
I was pretty promiscuous in my teens and twenties. I slept with a lot of boys/men when I wasn't in a relationship, simply because I was having (safe) fun and enjoyed it. I never got a name for myself, as it was never in my home town, but mainly in London when I lived there and whilst travelling/backpacking around the world.
Occasionally I would have very drunk one night stands, none of which I particularly regret, probably because I wasn't counting anymore, so one more didn't hurt... I would chalk it up to a crap experience sex-wise and just move on. Many a time I thought, "well this is a bit rubbish" MID ACT and either hurried him up or simply got up and left. Sometimes I would wake in a strange bed with a man I'd obviously had sex with and couldn't really remember. Those occasions were with people I knew quite well though.
There are 2 occasions where I absolutely think I WAS raped - consent or lack of actually doesn't come into it. Once when working in a tourist resort in Greece, one of the other workers, whom I quite liked offered to walk me home across a field as I was quite drunk. Halfway across the field he turned me round and started kissing me. I did kiss back as I liked him, but very quickly he had me on my knees, knickers down, doing me from behind whilst pulling my head back by my hair. I never said no, but neither did I say yes. I remember feeling quite confused at this point and for some reason had this moment of clarity when I knew I was being raped but as I still had a month or so to go at the resort I knew I wouldn't report it, as I was EMBARRASSED he had done this to me and didn't want anyone to know or my situation/friendships to be altered.
The other time was in London at a works Xmas party. A man much higher up than me, a married middle-aged boss in a different department, danced with me at the party then took me to a strip club. I was completely pissed, possibly my drink had been spiked with Rohypnol or something as I only have snapshot images of what then happened. I was taken to his office at work after the club and he sat me on his desk and wrapped my legs around him and had sex with me. He was very rough I think and my thighs got very bruised. He caught a cab with me and dropped me home afterwards and I remember crying all the way home and telling my flatmate he had raped me. (He was not someone I had ever fancied). The reason I think I was drug raped is that he phoned me at work the next day to see how I was. When I said, "why did you do that to me"? he denied we had ever been back to his office and that I must've dreamed what happened. He laughed and called me a silly girl. I knew he was lying as I described his office to a friend and said, "Whose office is this" and she confirmed it was his. I actually left the company a few days later as I couldn't handle seeing him ever again.
I've never really thought to report either of these rapes as (a)My sexual history is quite colourful and (b)I was drunk both times and (c)I never said the work "no". I just chastise myself for putting myself in such situations in the first place. But they do bother me, a lot. I think about them all the time. :-(
I really do think the nature of the rapes differs from the crappy one night stands. I have never ever said "you have my consent to have sex with me", neither have I said "no". But I do know the difference between my 2 rapes and the rest of the sex I have had, I KNOW it was rape.